Preheat oven to 450 degrees. In a large mixing bowl, add zucchini, eggs, flour, and salt and mix. Add parmesan and mozzarella cheese and mix until incorporated. On a 12-inch pizza dish, spread zucchini crust into a 10-inch circle. Bake for 13-16 minutes or until golden brown and set.
Remove the crust from the oven and reduce oven temperature to 400 degrees. Add pizza sauce, cheese, and toppings to the zucchini crust. Sprinkle with oregano and bake for 10-13 minutes more until cheese is melted and bubbly. Garnish with freshly chopped basil if desired.